I'm the founder of a beautiful Markdown editor. Actually, two:
Nota - https://nota.md. It's a notes app but a lot of our users use it as a markdown editor. Nota is quite powerful as a markdown editor. It has a lot of smartness built into it.
Caret - https://caret.io. We started with this - a beautiful Markdown editor. We aren't implementing new features for it but if you are on Windows or Linux it might be worth trying out. We still have new users coming in.
A common feature of the two is that they both are pleasant to use. We've put a lot of hard work into the UX (which is also hard to market and one of the reasons why you probably haven't heard about us).
This book changed my life. It's content is based on an entire life of research. I think I will learn new things every time I read it.
I like this question because I started re-reading a few books already. I find it valuable as I already know they are good and I can extract more from them the second/third/forth time.
It works in all browsers and it breaks long tasks. Sometimes it's even more powerful than scheduler.yield().
HN post: https://news.ycombinator.com/item?id=38864791.